/* ============================================================
   AWS Architecture Portfolio — shared stylesheet
   ============================================================ */

:root {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --bg-elev-2: #1c2330;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #9da7b3;
  --accent: #ff9900;      /* AWS orange */
  --accent-2: #4493f8;    /* link blue */
  --green: #3fb950;
  --red: #f85149;
  --purple: #bc8cff;
  --radius: 12px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.topbar .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}
.brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 10px;
}
.brand .dot { color: var(--accent); }
.topnav a {
  color: var(--text-dim);
  margin-left: 20px;
  font-size: 0.92rem;
}
.topnav a:hover { color: var(--text); text-decoration: none; }

/* ---------- Hero ---------- */
.hero {
  padding: 72px 0 48px;
  border-bottom: 1px solid var(--border);
  background:
    radial-gradient(900px 400px at 80% -10%, rgba(255,153,0,0.10), transparent),
    radial-gradient(700px 400px at 0% 0%, rgba(68,147,248,0.10), transparent);
}
.hero h1 { font-size: 2.4rem; margin: 0 0 12px; line-height: 1.2; }
.hero p { color: var(--text-dim); font-size: 1.12rem; max-width: 760px; margin: 0; }
.hero .kicker {
  color: var(--accent);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.78rem;
  margin-bottom: 14px;
}

/* ---------- Project cards ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
  padding: 44px 0;
}
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: border-color .15s ease, transform .15s ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card h3 { margin: 0 0 6px; font-size: 1.2rem; }
.card h3 a { color: var(--text); }
.card .tagline { color: var(--text-dim); font-size: 0.95rem; margin: 0 0 16px; flex: 1; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
.tag {
  font-size: 0.72rem;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  color: var(--text-dim);
  padding: 3px 9px;
  border-radius: 999px;
}
.card-actions { display: flex; gap: 12px; }
.btn {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  border: 1px solid var(--border);
}
.btn-primary { background: var(--accent); color: #1a1a1a; border-color: var(--accent); }
.btn-primary:hover { text-decoration: none; filter: brightness(1.08); }
.btn-ghost { color: var(--text); }
.btn-ghost:hover { text-decoration: none; border-color: var(--text-dim); }

/* ---------- Project page ---------- */
.page-head { padding: 48px 0 28px; border-bottom: 1px solid var(--border); }
.page-head .kicker { color: var(--accent); font-weight: 600; letter-spacing: 0.06em; text-transform: uppercase; font-size: 0.76rem; }
.page-head h1 { font-size: 2rem; margin: 10px 0 12px; }
.page-head p { color: var(--text-dim); font-size: 1.08rem; max-width: 820px; margin: 0 0 18px; }
.source-note { color: var(--text-dim); font-size: 0.92rem; margin: 0 0 14px; max-width: 820px; }
.repo-links { display: flex; flex-wrap: wrap; gap: 10px; }

.section { padding: 40px 0; border-bottom: 1px solid var(--border); }
.section:last-child { border-bottom: none; }
.section h2 { font-size: 1.5rem; margin: 0 0 6px; display: flex; align-items: center; gap: 10px; }
.section h2 .num {
  font-size: 0.85rem; color: var(--accent);
  border: 1px solid var(--accent); border-radius: 6px;
  padding: 2px 8px; font-weight: 700;
}
.section .lead { color: var(--text-dim); margin: 0 0 22px; max-width: 820px; }
.section h3 { font-size: 1.12rem; margin: 28px 0 8px; }

/* diagram container */
.diagram {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  margin: 18px 0;
  overflow-x: auto;
}
.diagram .caption {
  color: var(--text-dim);
  font-size: 0.86rem;
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
}
.mermaid { display: flex; justify-content: center; }

/* narrative bits */
ul.clean { padding-left: 20px; }
ul.clean li { margin: 6px 0; }

.callout {
  border-left: 3px solid var(--accent);
  background: var(--bg-elev);
  padding: 14px 18px;
  border-radius: 0 8px 8px 0;
  margin: 18px 0;
}
.callout.tradeoff { border-left-color: var(--purple); }
.callout.security { border-left-color: var(--green); }
.callout strong { color: var(--text); }

table.spec {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 0.92rem;
}
table.spec th, table.spec td {
  border: 1px solid var(--border);
  padding: 9px 12px;
  text-align: left;
  vertical-align: top;
}
table.spec th { background: var(--bg-elev-2); color: var(--text); }
table.spec td { color: var(--text-dim); }
table.spec code { color: var(--accent); }

code { font-family: var(--mono); background: var(--bg-elev-2); padding: 1px 5px; border-radius: 4px; font-size: 0.88em; }

/* footer */
footer { padding: 36px 0; color: var(--text-dim); font-size: 0.88rem; text-align: center; }

/* back link */
.backlink { display: inline-block; margin: 24px 0 0; color: var(--text-dim); font-size: 0.9rem; }

@media (max-width: 640px) {
  .hero h1 { font-size: 1.8rem; }
  .topnav a { margin-left: 12px; font-size: 0.82rem; }
}